NK Series Working Principle
Solar home inverter working principle: when the normal work of the solar photovoltaic controller by inverter power supply, then the input dc inverter is transformed into the pure sinusoidal alternating current output. When abnormal PV input, battery to the inverter power supply. When the battery discharge into the low voltage point, system a battery low voltage signals, and then into the grid operation mode; When solar or battery voltage, dc voltage return to set up the system signal dc output is normal, and then into the inverter running mode.( Inside the machine has two 50A built-in solar controller)| Model (NK) | Solar Home Inverter | |
| 2.5K48 | 5K48 | |
| 2500W | 5000W | |
| DC48V | DC48V | |
| Grid (Mains) Mode Specifications | ||
| Input voltage waveform | Pure Sine Wave(mains or generator) | |
| Rated output voltage | 220Vac | |
| Low voltage protection | 180Vac±4% | |
| low voltage recovery point | 190Vac ±4% | |
| High voltage protection | 260Vac±4% | |
| High voltage recovery point | 250Vac±4% | |
| Max AC input voltage | 270Vrms | |
| Rated input frequency | 50Hz/ 60Hz (auto) | |
| Low voltage recovery point by frequency |
58+0.3Hz ( 60Hz ); 48+0.3Hz ( 50Hz ) |
|
| Low voltage shut-off point by frequency |
57+0.3Hz ( 60Hz ); 47+0.3Hz ( 50Hz ); |
|
| High voltage recovery point by frequency |
64+0.3Hz ( 60Hz ); 54+0.3Hz ( 50Hz ) |
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| High voltage shut off point by frequency |
65+0.3Hz ( 60Hz ); 55+0.3Hz ( 50Hz ) |
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| Bypass output voltage waveform | Same as Input Waveform | |
| Overload protection | Breaker On | |
| Short circuit protection | Breaker On | |
| Power efficiency | >95% | |
| Switching time (AC to DC) | 5ms | |
| Switching time(DC to AC) | 5ms | |
| Bypass Max load current | 30A | |
| Inverter Mode Specification | ||
| Model (NK) | NK Model | |
| 2.5K48 | 5K48 | |
| Output voltage waveform | Pure sine wave | |
| Rated output capacity(VA) | 2500 | 5000 |
| Rated output power(W) | 2500 | 5000 |
| PF | 0.9~1.0 | |
| Rated output voltage(V) | 220Vac | |
| Rated output frequency (Hz) | 50Hz ± 0.3Hz | |
| Auto track main frequency(Hz) | Yes (from the first start) 50Hz @48-54Hz 60Hz @58-64Hz |
|
| Output voltage range | ±10% rms | |
| Efficient | >85% | |
| Overload protection (SMPS load) | (110% |
|
| Peak capacity (1s) | 7500VA | 15000VA |
| Short Circuit protection | Current limit(1s after power off) | |
| Rated DC input voltage | 48V | |
| Min DC voltage | 40V | |
| Low-voltage alarm | 10.5Vdc±0.3Vdc(12V)/21.0Vdc±0.6Vdc(24V)/42.0Vdc±1.2Vdc(48V) | |
| Auto cut off level when DC input voltage low | 10.0Vdc±0.3Vdc(12V)/20.0vdc±0.6Vdc(24V)/40.0Vdc±1.2Vdc(48V) | |
| Cut off level when Input over voltage alarm | 16.0Vdc±0.3Vdc(12V)/32.0Vdc±0.6Vdc(24V)/64.0Vdc±1.2Vdc(48V) | |
| Input over-voltage recovery | 15.5Vdc±0.3Vdc(12V)/31.0Vdc±0.6Vdc(12V)/62.0Vdc±1.2Vdc(48V) | |
| PV Input Specification | ||
| PV input working voltage range | 24V system | DC30~DC100V |
| 48V system | DC60~DC150V | |
| Input low-voltage protection point | 24V system | DC30V |
| 48V system | DC60V | |
| Input low-voltage recovery point (start charging voltage point) | 24V system | DC34V |
| 48V system | DC65V | |
| Input over-voltage protection point | 48V system | DC145V |
| Charging rated current | 48V system | 50A |
| Temperature coefficient | 12V/24V/48V system | ±0.02%/℃ |
| Auto temperature compensation | 12V/24V/48V system | 14.2V-（max -25℃）*0.3 |
| Output voltage lines wave-peak | 12V/24V/48V system | 200mV |
| Output stab-volt precision | 12V/24V/48V system | ≤±1.5% |
| Output discharge specification | ||
| Output voltage | According to battery voltage | |
| Output low-voltage protection | Default 10.5V, 11V back to recovery, can be set; | |
| Output rated current | 50A | |
| Optional Wind characteristics | ||
| Input voltage | 48VAC | |
| Wind rating power input | 1600W | |
| Wind max power input | 35A | |
